Stereoprinting block



Sept. 8, 1931.

J.FmCKE STEREOPRINTING BLOCK Filed Nov.

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AT'EQRN'EYS.

Patented Sept. 8, 1931 JOSEF FRICKE, OF DILLINGEN-SAAR, GERMANY STEREOPBINTING BLOCK Application filed November 12, 1929, Serial No. 406,548, and in Germany May 22, 1929.

The use of large, for instance full page, stereo blocks for repeat work in printing, involves ditlicultics in that the wooden base of such a block, even if made of the very best seasoned wood, becomes warped and in time it is necessary to straighten it and refit it, which work is difficult and takes a long time.

This invention is intended to avoid the said drawback and consists in using an iron [0 backing plate which is lined with wood at the back in Order to afford a hold to the nails which must be driven in.

The new backing plate for large blocks is shown in the accompanying drawings in which Figure 1 is a plan,

Figure 2 is a back view, and

Figure 3 is a cross section through the plate on the line A-B in Figure 2.

Figures 4 and 5 are respectively a plan and elevation of a template employed when using the backing plate.

a is an iron plate which is provided on the back with ribs Z), c which rest on a support in the printing press. Its upper face is flat and is intended to support if desired with the interposition of a layer of paper, the stereo marked d in Figure 3.

In order to enable the stereo to be secured to the iron plate, the latter is provided all over in a uniform manner with holes 6 for nails to be driven through. In Figures 1 and 2, these holes are shown only on one'quarter of the plate, but the other parts of the plate are also provided with such holes.

In order to afford a good hold to the nails driven through the stereo and the holes of the iron plate, the latter between the ribs 6, 0 is backed with wood f which however is of 40 no importance as regards the shape of the plate. The holes 6 which are situated on the ribs, are drilled obliquely so that the nails can still grip the wood in an effective manher as may be seen from Figure 3. It might be difficult to hit exactly the holes in the plate a with nails driven through the stereo, and in order to facilitate this a template 9 of sheet metal is used which covers one quarter of the plate a and is provided 59 at one side with registering pins h which fit into holes 91 in the holes for the said pins plate a. Obviously it must be provided also in stereos which are larger than one quarter of the plate a.

The template 9 is provided with holes is of the same number and arrangement as those in the plate a, so that the holes of thetemplate and of the plate a coincide exactly.

If therefore a stereo is to be secured to the plate, it is placed on the latter in such a manner that its holes coincide with the holes i, put on so that its pins and the template is h enter the holes 2'.

It is then possibleto mark the nail holes in the stereo by means of the template and thus it is, always possible to find the holes in the plate a when driving in the n ails.

As the stereos are secured to such a backing plate only during the whilst otherwise they ar printing operation, e stored without the plate a few such backing plates will be sufficient for one printing machine. No warping of the backing plate and therefore of the stereo can take place.

Having now particularly described and ascertained the nature of our said invention and in what manner the same is to be performed, I

declare that what I claim is 1. A backing for stereotypes, comprising an iron plate provided on its back surface with ribs adapted to rest on a support in a printing press, sald ribs being d sposed so as to divide the back surface of the plate into a plurality of separated compartments. and

a wooden block disposed in each of said compartments in snug engagement with its bounding ribs,

said plate being provided throughout its area with a plurality of perforations for ing the stereotypes to 2. In combination, a

the passage of means for securthe wooden blocks. backing for stereotypes as set forth in claim 1, and a sheet metal template provided with perforations adapted to register with those of the iron plate.

3. In combination, a types as set template provided with ed to register with those of the iron backing for stereoforth in claim 1, a sheet metal perforations adaptplate,

and cooperating means carried by said template and plate for ensuring registration.

J OSEF FRICKE. 

